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Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
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Current-induced circular dichroism on metallic surfaces: A first-principles study.

Farzad Mahfouzi1,2, Mark D Stiles1, Paul M Haney1

  • 1Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

Physical Review. B
|February 19, 2025
PubMed
Summary
This summary is machine-generated.

Current-induced optical response in metallic films is evaluated using ab initio calculations. Findings reveal significant differences between self-rotation orbital magnetization and atom-centered approximation orbital moments, impacting optical measurement interpretations.

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Physics

Background:

  • Orbital magnetization and current-induced optical response in metallic films are crucial for spintronic devices.
  • The relationship between optical absorption and orbital magnetization is described by sum rules, particularly involving the self-rotation contribution.
  • Atom-centered approximation (ACA) is commonly used to calculate orbital moment accumulation.

Purpose of the Study:

  • To evaluate the current-induced optical response and orbital moment accumulation at metallic film surfaces using ab initio calculations.
  • To compare the gauge-invariant self-rotation contribution to orbital magnetization (M → SR) with ACA orbital moment accumulation.
  • To investigate the impact of finite-size effects and layer thickness on these quantities.

Main Methods:

  • Utilized ab initio calculations to simulate metallic film surfaces.
  • Computed current-induced optical response and orbital moment accumulation.
  • Calculated the gauge-invariant self-rotation contribution (M → SR) and compared it with the atom-centered approximation (ACA).

Main Results:

  • Found significant differences between M → SR and ACA orbital moment accumulation, with M → SR being an order of magnitude larger.
  • Observed substantial finite-size effects in the calculated M → SR for a Pt thin film.
  • Determined that the saturation length scale for surface accumulation is on the order of the mean free path for both M → SR and ACA.

Conclusions:

  • The discrepancies between M → SR and ACA highlight limitations of the ACA model for interpreting optical measurements.
  • Results suggest that M → SR provides a more comprehensive description of current-induced orbital magnetization.
  • The study underscores the importance of considering finite-size effects and layer thickness in theoretical models of surface magnetism.